Settling up with terrible part-enemy (9)

I believe the answer is:

repayment

I'm a little stuck... Click here to teach me more about this clue!

'settling up' is the definition.
I can't judge whether this defines the answer.

'terrible part-enemy' is the wordplay.
'terrible' indicates anagramming the letters.
'part'+'enemy'='partenemy'
'partenemy' with letters rearranged gives 'REPAYMENT'.

'with' acts as a link.

Can you help me to learn more?

(Other definitions for repayment that I've seen before include "Refund" , "Reimbursement" , "Money refunded" , "Type of mortgage" .)

I've seen this clue in the Sydney Morning Herald.

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